BLG 151 Chapter Notes - Chapter 5: Lipid Raft, Intermediate Filament, Lipid Bilayer
26 Sep 2015
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Document Summary
Generally larger than bacterial and archaeal cells, very diverse sizes. Organelles: intracellular structures that perform specific functions in cell. Compartmentalizing allows diff cellular functions to separate thfo they can take place simultaneously under controlled conditions. Large surfaces make greater respiratory and photosynthetic activity bc processes located exclusively in membr. Intracytoplasmic membr complex serves as transport sys, move mat btw diff cell locations. Plasma membr is lipid bilayer composed of high proportion of sphingolipids and sterols. In lipids, fatty acids attached to glycerol w/ ester links. Sphingolipids and sterols contribute to strength of plasma membr, able to pack closely together. Able to resist osmotic pressure stresses even w/o cell walls. Lipid rafts differ in lipid and protein composition. Facilitated diffusion more prominent in eukary, also use passive diffusion, endocytosis and active transport. Photosynthetic protists have layered appearance on cell wall, a lot of polysacc (cellulose)
